docs: def expectRegion(self, filename, x, y, maxrms=0):
          """ Wait until a portion of the screen matches the target image
  
              The region compared is defined by the box
              (x, y), (x + image.width, y + image.height)
          """
          log.debug('expectRegion %s (%s, %s)', filename, x, y)
          return self._expectFramebuffer(filename, x, y, maxrms)